[GE users] Fair Share Formulas

Shannon V. Davidson svdavidson at charter.net
Fri Aug 17 17:18:18 BST 2007


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Here's some good background on the fair share algorithm.

ftp://ftp.cs.usyd.edu.au/piers/share.pdf

Shannon


Daniel Templeton wrote:
> Hermann,
>
> There is no formula for calculating the tickets.  It's an iterative 
> algorithm that is highly dependent on situation and configuration.  
> Unfortunately, we don't have any clear documentation of the 
> algorithm.  If you don't mind reading source code, it's all contained 
> in the gridengine/source/libs/sched/sgeee.c file.
>
> There are some specific situations when the algorithm reduces to a 
> formula.  For more information about those situations, check out the 
> policy section of the class I delivered at Georgetown:
>
> https://www.middleware.georgetown.edu/confluence/display/HPCT/Advanced+Sun+Grid+Engine+Configuration+and+Administration 
>
>
> A wise, old Grid Engine engineer once told me that the policy system 
> in Grid Engine isn't meant to be calculable on paper.  It's more of a 
> steering wheel than an exact setting.  You can adjust the behavior by 
> tweaking the values, but don't expect to be able to get predictable 
> numbers.
>
> Daniel
>
> Erik Soyez wrote:
>> This could be helpful:
>>
>> ------------------------------------------------------------------------
>> http://www.sun.com/blueprints/1005/819-4325.pdf
>> http://gridengine.sunsource.net/nonav/source/browse/~checkout~/gridengine/doc/htmlman/manuals.html?content-type=text/html 
>>
>>   -> sched_conf
>>   -> sge_priority
>> ------------------------------------------------------------------------
>>
>> Erik Soyez.
>>
>>
>> On Fri, 17 Aug 2007, Hessling wrote:
>>
>>> Hi,
>>>
>>> currently I am investigating "pure" fair share,
>>> i.e. the other scheduling options (functional,
>>> override) are switched off.
>>>
>>> I am investigating the influnce of different share
>>> values for the project nodes and the user (sub)nodes
>>> of the share tree, and the dependence on the fair share
>>> parameters "halftime" and "compensating factor".
>>>
>>> In the manuals I found some brief description
>>> but no formulas. Explicit formulas would certainly
>>> be of help to obtain at a better understanding
>>> of SGE's fair share. Are they published somewhere?
>>>
>>> Thanks for any hints,
>>> Hermann
>>>
>>> PS: I am running SGE 6.1.
>>
>> -- 
>>
>
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-- 
____________________________________________

Shannon V. Davidson <svdavidson at charter.net>
Senior Software Engineer               Appro
636-633-0380 (office)     443-383-0331 (fax)
____________________________________________


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